The leader of the Yagyu Four Devas serving the Yagyu family, acting as Kyubei Yagyu's bodyguard and caretaker. Usually a calm young man with squinting eyes, he is actually short-tempered and possesses high combat ability. He has doted on Kyubei since her childhood, and his overprotective behavior often gets him shunned. While he has a lecherous and perverted side, his loyalty to his master is incredibly deep.

The heir to the prestigious Yagyu family and a genius swordsman trained in kenjutsu since childhood. Usually dignified and composed, she has a compassionate side and cares deeply for her comrades. She has held a strong admiration and obsession for Tae Shimura since childhood, and her desire to protect her is her primary motivation. Due to her androgynous appearance and behavior, she is often mistaken for a man, but she is female. She boasts overwhelming strength in combat.